<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        h1,h3{
            font-size: 100px;
        }
    </style>
</head>
<body>
    <h1>hello</h1>
    <h2>world</h2>
    <h3>java</h3>
</body>
</html>